import axios from 'axios'
import { MessageBox, Message } from 'element-ui'
import store from '@/store'
import cache from '@/plugins/cache'
import errorCode from '@/utils/errorCode'
import { getToken } from '@/utils/auth'
import { tansParams } from '@/utils/yuezhi'

// 是否显示重新登录
let isReloginShow;

axios.defaults.headers['Content-Type'] = 'application/json;charset=utf-8'

// 创建axios实例
const service = axios.create({
    baseURL: 'http://localhost:8081/yuezhi', // url = base url + request url
    withCredentials: true, // 当跨域请求时发送cookie
    timeout: 10000 // 超时
})

// request拦截器
service.interceptors.request.use(config => {
    // 是否需要设置 token
    const isToken = (config.headers || {}).isToken === false
    // 是否需要防止数据重复提交
    const isRepeatSubmit = (config.headers || {}).repeatSubmit === false
    if (getToken() && !isToken) {
        config.headers['Authorization'] = getToken()
    }

    // get请求映射params参数
    if (config.method === 'get' && config.params) {
        let url = config.url + '?' + tansParams(config.params);
        url = url.slice(0, -1);
        config.params = {};
        config.url = url;
    }
    if (!isRepeatSubmit && (config.method === 'post' || config.method === 'put')) {
        const requestObj = {
            url: config.url,
            data: typeof config.data === 'object' ? JSON.stringify(config.data) : config.data,
            time: new Date().getTime()
        }
        const sessionObj = cache.session.getJSON('sessionObj')
        if (sessionObj === undefined || sessionObj === null || sessionObj === '') {
            cache.session.setJSON('sessionObj', requestObj)
        } else {
            const s_url = sessionObj.url;                  // 请求地址
            const s_data = sessionObj.data;                // 请求数据
            const s_time = sessionObj.time;                // 请求时间
            const interval = 1000;                         // 间隔时间(ms)，小于此时间视为重复提交
            if (s_data === requestObj.data && requestObj.time - s_time < interval && s_url === requestObj.url) {
                const message = '数据正在处理，请勿重复提交';
                console.warn(`[${s_url}]: ` + message)
                return Promise.reject(new Error(message))
            } else {
                cache.session.setJSON('sessionObj', requestObj)
            }
        }
    }
    return config
},
error => {
    // 请求发生错误
    console.log(error) // for debug
    return Promise.reject(error)
})


// 响应拦截器
service.interceptors.response.use(response => {
    const data = response.data
    const code = data.code || 200 // 未设置状态码则默认成功状态
    const msg = errorCode[code] || data.message || errorCode['default']
    if ( code === 401) {
        if (!isReloginShow) {
            isReloginShow = true
            MessageBox.confirm('登录状态已过期，请重新登录', '系统提示', {
                confirmButtonText: '重新登录',
                cancelButtonText: '取消',
                type: 'warning'
            }).then(() => {
                isReloginShow = false
                store.dispatch('Login').then(() => {
                    // 如果是登录页面不需要重新加载
                    if (window.location.hash.indexOf("#/login") !== 0) {
                        location.href = '/index';
                    }
                })
            }).catch(() => {
                isReloginShow = false
            })
        }
        return Promise.reject('无效的会话，或者会话已过期，请重新登录。')
    }else if (code === 500) {
        Message({
            message: msg,
            type: 'error'
        })
        return Promise.reject(new Error(msg))
    }else if (code !== 200) {
        Notification.error({
            title: msg
        })
        return Promise.reject('error')
    }else {
        return data
    }
},
error => {
    console.log('err' + error) // for debug
    let { message } = error
    if (message === 'Network Error') {
        message = '后端接口异常'
    }else if ( message.includes("timeout")) {
        message = '系统接口请求超时'
    }else if (message.includes("Request failed with status code")) {
        message = '系统接口' + message.substr(message.length - 3) + "异常";
    }
    Message({
        message: message,
        type: 'error',
        duration: 5 * 1000
    })
    return Promise.reject(error)
})

export default service
